VMware NSX Username Enumeration (pre9.0.1, 4.2.2.2/4.2.3.1, 4.1.2.7, NSXT 3.2.4.3)
CVE-2025-41252 Published on September 29, 2025
Username enumeration vulnerability
Description: VMware NSX contains a username enumeration vulnerability. An unauthenticated malicious actor may exploit this to enumerate valid usernames, potentially leading to unauthorized access attempts.
Impact: Username enumeration facilitates unauthorized access.
Attack Vector: Remote, unauthenticated.
Severity: Important.
CVSSv3: 7.5 (High).
Acknowledgments: Reported by the National Security Agency.
Affected Products:
* VMware NSX 9.x.x.x, 4.2.x, 4.1.x, 4.0.x
* NSX-T 3.x
* VMware Cloud Foundation (with NSX) 5.x, 4.5.x
Fixed Versions:
* NSX 9.0.1.0; 4.2.2.2/4.2.3.1 http://4.2.2.2/4.2.3.1 ; 4.1.2.7; NSX-T 3.2.4.3; CCF async patch (KB88287).
Workarounds: None.
Vulnerability Analysis
CVE-2025-41252 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Type
What is a Side Channel Attack Vulnerability?
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor, which exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not. Discrepancies can take many forms, and variations may be detectable in timing, control flow, communications such as replies or requests, or general behavior. These discrepancies can reveal information about the product's operation or internal state to an unauthorized actor. In some cases, discrepancies can be used by attackers to form a side channel.
CVE-2025-41252 has been classified to as a Side Channel Attack vulnerability or weakness.
Products Associated with CVE-2025-41252
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Affected Versions
VMware NSX:- Version VMware NSX 9.x.x.x, 4.2.x, 4.1.x, 4.0.x is affected.
- Version VMware NSX-T 3.x is affected.
- Version VMware Cloud Foundation (with NSX) 5.x, 4.5.x is affected.
- Version VMware NSX 9.0.1.0; 4.2.2.2/4.2.3.1; 4.1.2.7; NSX-T 3.2.4.3; CCF async patch (KB88287) is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.